Intel Core i3 8100 's Advantages
Higher base frequency (3.6GHz vs 3.4GHz)
Lower TDP (65W vs 150W)
Intel Core i9 12900KS 's Advantages
Released 4 years and 6 months late
Better graphics card performance
Higher specification of memory (4800 vs 2400)
Larger memory bandwidth (76.8GB/s vs 37.5GB/s)
Newer PCIe version (5.0 vs 3.0)
Larger L3 cache size (30MB vs 6MB)
More modern manufacturing process (10nm vs 14nm)